Add and pass one regression test for radio widget parser

[benchristel]

This PR is a "pilot" demonstrating how regression testing for the PerseusItem
parser will work. The regression test uses production data found by running the
exhaustive test tool.

Issue: LEMS-2582

Test plan:

yarn test

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/mean-pens-grow.md, packages/perseus/src/util/parse-perseus-json/perseus-parsers/radio-widget.ts, packages/perseus/src/util/parse-perseus-json/regression-tests/parse-perseus-json-regression.test.ts, packages/perseus/src/util/parse-perseus-json/regression-tests/data/radio-missing-noneOfTheAbove.json

---

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[benchristel]

It's too bad JSON doesn't allow comments. I'd love it if we could include some indication of what bug/failure is being tested for by this file.

Maybe I could change the extension to .yaml? (YAML is a superset of JSON)

Oh, but then JSON.parse() will fail. :(

[mark-fitzgerald]

I would suggest a comment property, but since this tests for type checking, that would probably fail. Would it be worth adding an optional comment property as a valid field within all Perseus JSON - not in this PR, but maybe something at an opportune time?

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (269254a) and published it to npm. You
can install it using the tag PR1871.

Example:

yarn add @khanacademy/perseus@PR1871

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1871

[github-actions]

Size Change: 0 B

Total Size: 1.29 MB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.9 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	77.8 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	699 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/index.js	420 kB
packages/perseus/dist/es/strings.js	3.55 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

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